Ancistomus spilomma L-036

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Ancistomus spilomma L-036 is a South American loricariid known in the aquarium hobby under the L-036 code. Native to the Rio Tocantins in Brazil, this bottom-dwelling catfish is recognized by its sturdy body, sucker mouth, and spotted pattern. Although understated in appearance, it becomes especially attractive in an aquarium furnished with wood, rocks, and hiding places. This form is moderately uncommon in the specialized trade. The available fish are wild-collected, so careful acclimation, well-oxygenated water, and a varied diet are important for helping them settle successfully.

General species description

Ancistomus spilomma L-036 is a loricariid, a group of South American catfish adapted to life close to the bottom. It is known in the aquarium trade as L-036, a code used before its scientific identity was more clearly established. Its flattened body and strong pectoral fins help it hold onto rocky surfaces and submerged wood in flowing areas. It is generally peaceful, although an individual may defend a shelter from another specimen, particularly in a confined aquarium. Its availability is intermediate: it is less common than many popular plecos, but remains sought after by keepers of wild loricariids. A mature, stable aquarium is preferable to a recently established setup.

Geographic origin and biotope

Ancistomus spilomma L-036 comes from Brazil, within the basin of the Rio Tocantins. Its natural habitat includes river sections with alternating rocks, gravel, submerged wood, and flowing water. The water is generally warm, clear to slightly stained, and well oxygenated. To reproduce these conditions, provide noticeable flow, efficient filtration, and good circulation rather than a layout made only of sand. Roots and crevices provide essential resting areas and shelter. Vegetation may be sparse in rocky sections, while riverbanks and slower areas support denser marginal growth. In an aquarium, water stability is more important than pursuing extreme parameters.

Precise location and local name

The reference locality for Ancistomus spilomma L-036 is the Rio Tocantins in Brazil. In the aquarium trade, the code L-036 remains the most practical and recognizable designation. Descriptive names such as “spotted pleco” may refer to its appearance, but they do not replace the collection code. This type of designation is especially useful among loricariids because several species or closely related forms may circulate before taxonomic identification becomes uniform. To avoid confusion, keep the L-036 code together with the scientific name and record the origin of each shipment. Wild fish should also be quarantined when they arrive.

Appearance and physical characteristics

Ancistomus spilomma L-036 has the typical loricariid shape: an armored body, flattened underside, and lower sucker mouth. Its base color is generally brownish to gray-brown, with distinct dark spots distributed across the body and fins. Bony plates protect the flanks, while the pectoral and dorsal fins may show spotting or contrasting coloration. Its mouth allows it to cling to surfaces and graze on food deposits. Like many armored catfish, it appreciates narrow shelters and shaded areas. Moderate lighting, natural wood, and hiding places encourage natural behavior while helping reduce stress.

General diet

Ancistomus spilomma L-036 is primarily omnivorous with a detritivorous tendency, relying heavily on plant matter and organic material found on surfaces. Its diet should include bottom-feeder wafers containing plant ingredients, algae-based tablets, and blanched vegetables such as zucchini or cucumber. Small amounts of richer foods, including carnivorous wafers or frozen foods, can supplement the diet without becoming its foundation. Natural wood is recommended in the layout because it is explored by many loricariids and provides a grazing surface. Feed mainly after the lights go out and remove leftovers to protect water quality.

Essential data

• River of origin: Rio Tocantins
• Local name used: L-036; spotted pleco
• Origin of the scientific name: Ancistomus identifies the genus; spilomma describes the spotted appearance associated with the specific name.
• Full-name etymology: Ancistomus comes from Greek and refers to a hook-like structure; spilomma comes from Greek spilos, spot, and omma, eye or appearance of the eye.
• Common/vernacular names: Spotted pleco; L-036
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: an sis TOH moos - spy LOHM mah
• Discovery: Alexandre Cardoso and Claude Weber, 2000
• Maximum adult size: About 15 cm
• Water temperature and pH: 24 to 29 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Warm, rocky, well-oxygenated river sections with submerged wood and marginal vegetation.
• Typical tankmates: Panaque armbrusteri L-027c, Pseudancistrus asurini L-067, Cichla piquiti, Retroculus lapidifer, Tocantinsia piresi
• Temperament and behavior: Peaceful and bottom-oriented, most active at dusk and during the night; may defend shelters.
• Water depth: Shallow to intermediate sections associated with rocky substrates and submerged wood.
• Sexual dimorphism: Difficult to see in young fish; mature males may have a broader head and more developed odontodes.
• Bottom structure and flow: Rocks, gravel, submerged wood, and moderate to strong flow; well-oxygenated water.

For greater success

To keep Ancistomus spilomma L-036 successfully, provide an aquarium with natural wood, hiding places, and well-distributed flow. Warm, clean, highly oxygenated water suits wild specimens, which should be acclimated gradually. Offer varied foods after the lights go out and watch for competition around shelters. Maintaining excellent water quality and avoiding overcrowding are the main keys to long-term adaptation.